(cf former s 148J)
(1) A reference in sections 137, 138 and 139 to conduct that constitutes a contravention of section 133 or 343 (4) includes a reference to--(a) conduct engaged in by a person before the commencement of this section, and(b) conduct engaged in before the commencement of section 133 or 343 (4) that would, if engaged in after that commencement, have constituted a contravention of the provision.
(2) However, a person cannot be considered to have persistently engaged in conduct that constitutes a contravention of section 133 or 343 (4) unless at least one instance of that conduct occurred after the commencement of this section.
For the purposes of section 138, at least one instance of the conduct must have occurred after the commencement of that section.